S.C. Code Ann. § 40-53-170: Allegation and proof of valid license required in action or counterclaim relating to agreement or service for which license is required.

No action or counterclaim shall be maintained by any person in any court in this State with respect to any agreement or service for which a license is required by this chapter without alleging and proving that such person had a valid license at the time of making such agreement or performing such services.